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Permanent magnet synchronous motor (PMSM) using a decoupled method may have the same performance as DC motor. So the parameter design of its' regulators can be made according to the traditional DC regulator design method. However, the PMSM and its' driving converter have the characteristics of strong non-linear, which result to the differences between the designed parameters and the real values. Based on the closed loop control of speed and current, the simulation model of the surface-mounted PMSM (SPMSM) vector control system with the Space Vector Pulse Width Modulation (SVPWM) method was proposed and realized in the paper, which highly simulated the real system. The principles of regulated PI were given, which had been proved by the experimental platform based on DSP2812. The experimental results are in accordance with the simulation results, which prove that the method can effectively improve the performance of the system.